package net;

import java.io.IOException;
import java.net.*;
import java.util.Scanner;

public class UdpEchoClient {
    private DatagramSocket socket = null;
    private String serverIP;
    private int serverPort;

    public UdpEchoClient(String ip, int port) throws SocketException {
        serverIP = ip;
        serverPort = port;
        socket = new DatagramSocket();
    }

    public void start() throws IOException {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println(">> ");
            String request = scanner.next();
            if (request.equals("exit")) {
                System.out.println("good bye!");
                break;
            }
            DatagramPacket requestPacket = new DatagramPacket(request.getBytes(), request.getBytes().length
                    , InetAddress.getByName(serverIP), serverPort);

            socket.send(requestPacket);
            DatagramPacket responsePacket = new DatagramPacket(new byte[4096], 4096);
            socket.receive(responsePacket);
            String response = new String(responsePacket.getData(), 0, responsePacket.getLength());
            System.out.printf("req: %s;resp: %s\n", request, response);
        }

    }

    public static void main(String[] args) throws IOException {
        UdpEchoClient udpEchoClient = new UdpEchoClient("127.0.0.1", 9090);
        udpEchoClient.start();
    }
}
